On a rainy Saturday morning in Kyoto, six-year-old Ren stood in the kitchen doorway and watched his father repair a broken drawer.
His father had spread a screwdriver, measuring tape, screws, and a small electric drill across the floor.
Ren watched carefully.
The drill whirred.
The screwdriver turned.
The measuring tape snapped back with a satisfying metallic sound.
“Almost done,” his father said.
Ren wanted to help.
He reached for the screwdriver, but his father gently moved it away.
“Not yet. It can be dangerous.”
Ren frowned.
He understood the warning, but that did not make the desire disappear.
For several minutes, he simply watched.
Then he disappeared into his room.
His father assumed he had lost interest.
He hadn’t.
Ren returned carrying a wooden ruler, three pieces of building blocks, a plastic cup, and an old TV remote control whose batteries had long since been removed.
He placed them carefully on the floor.
The ruler became his measuring tape.
The plastic cup became a container for screws.
The wooden blocks became pieces of a drawer.
And the remote control became his electric drill.
“Okay,” Ren announced.
He crouched beside the imaginary drawer.
“First, we measure.”
He stretched the ruler across a block.
“Twenty centimeters.”
His father glanced over.
Ren pressed the end of the remote against another block.
“Brrrrrrrrrrrr.”
He began repairing the imaginary drawer.
His father smiled.
“What are you doing?”
“Fixing it.”
“With what?”
Ren looked at the remote.
“My drill.”
His father laughed.
But later that afternoon, he began wondering whether Ren’s game was more sophisticated than it appeared.
At a nearby university, developmental psychologist Dr. Aki Shimizu was studying children’s pretend play. She explained that children do not simply copy adults mechanically.
“Children observe an adult’s goal, identify the important structure of the activity, and then reconstruct it using whatever resources they have available,” she said.
The distinction mattered.
A child did not need an actual cash register to pretend to be a shopkeeper.
A cardboard box could become a supermarket counter.
Bottle caps could become coins.
A pencil could become a barcode scanner.
A blanket could become a hospital bed.
The substitute object did not need to resemble the original perfectly. What mattered was the role assigned to it.
This ability is closely related to symbolic representation: one object temporarily stands for another because the child understands that the meaning comes from the imagined situation rather than from the physical object itself.
Ren was demonstrating exactly that.
His remote control was not really a drill.
But inside the imaginary world he had constructed, it functioned as one.
The following weekend, Ren’s father came home carrying groceries.
Ren immediately began imitating him.
He took a small backpack, filled it with empty boxes, and walked around the living room.
“Delivery!”
He placed a cardboard package beside the sofa.
“Signature, please.”
His father pretended to sign.
Ren nodded seriously.
“Thank you very much.”
Then he picked up a toy telephone.
“Yes, this is the delivery company.”
He paused.
“Your package is delayed.”
His father burst out laughing.
“Where did you learn that?”
“You say it when your packages don’t come.”
Ren had noticed something adults often forget:
children are watching even when adults think they are not.
They observe not only what adults do, but also the sequence of actions, the language used, the social roles involved, and the emotional tone surrounding the activity.
And when they cannot participate directly, they create a miniature version of the adult world.
The kitchen becomes a restaurant.
A sofa becomes a train.
A cardboard box becomes a car.
A stick becomes a microphone.
A towel becomes a doctor’s coat.
A plastic spoon becomes a magic wand.
To adults, these objects look like toys.
To the child, they are temporary tools inside a model of reality.
That was why Ren’s father began noticing something else.
Ren’s games changed whenever his father learned something new.
After watching him use a smartphone to pay at a store, Ren began pretending his toy phone was a payment terminal.
After watching his mother prepare a video meeting, he arranged stuffed animals in a circle and announced:
“Everybody, please mute your microphone.”
After seeing his father struggle with a flat-pack cabinet, Ren spent an entire afternoon assembling and disassembling blocks while complaining:
“Why are there always extra parts?”
The games were becoming increasingly complex.
But they were not simply becoming more realistic.
They were becoming more abstract.
Ren was extracting the structure of adult activities and rebuilding that structure with whatever objects were available.
One evening, his father found him sitting at the table with a cardboard box.
“What are you making?”
“A computer.”
“That doesn’t look like a computer.”
Ren looked offended.
“It is a computer.”
His father examined it more carefully.
There was a hole cut into the front.
A row of bottle caps served as buttons.
A piece of paper displayed several hand-drawn icons.
Ren pressed one.
“Email.”
He pressed another.
“Meeting.”
Then another.
“Game.”
His father smiled.
“That’s quite a computer.”
Ren nodded.
“It’s the one I can use.”
And that sentence captured something fundamental about childhood pretend play.
The child is not merely failing to obtain the adult’s tools.
The child is solving the problem of access.
Adults possess specialized objects, specialized knowledge, and specialized social roles. Children often possess none of these.
So they construct substitutes.
They take an ordinary object and give it an extraordinary function.
A remote becomes a drill.
A cardboard box becomes a computer.
A stick becomes a microphone.
A blanket becomes a hospital.
A chair becomes a bus.
The physical world remains unchanged.
But the child’s interpretation of it changes completely.
And perhaps that is why children’s play can look so trivial to adults while being so intellectually demanding for the child.
The child is practicing a peculiar human ability:
turning the world into something it is not—without forgetting what it actually is.
Years later, Ren would probably forget the plastic remote control that served as his imaginary drill.
But the mental operation behind it would remain.
He would use symbols.
He would simulate situations.
He would rehearse social roles.
He would imagine alternative possibilities.
And eventually, he might design things that did not yet exist.
His father had thought Ren was merely playing.
In reality, Ren had been doing something much older and more important.
He had been learning how humans transform reality into ideas—and then use those ideas to build a new reality.
All names of people and organizations appearing in this story are pseudonyms
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